#header{
	height: 100px;
	position: relative;
	border: 1px solid red;
}

#wrapper{
	min-height: 500px;
	border: 1px solid red;
}

#footer{
	border: 1px solid red;
}

.container{
	position: relative;
}

.leftcol{
	position: absolute;
	width: 200px;
	border: 1px solid red;
}
.centercol{
	position: absolute;
	width: 600px;
	left: 200px;
	border: 1px solid red;
}
.rightcol{
	position: absolute;
	left: 800px;
	width: 180px;
	border: 1px solid red;
}
/**in centercol**/
.main{
	
}